I've just discovered a mod named Synergy, which is:
Quote:
Synergy is the Half-Life 2 cooperative modification that enables you to play with others through Half-Life 2 and it's episodes (Episode 1 and 2), as well as our own levels.
but, more excitingly...
Quote:
You may also install other third-party mods, such as MINERVA: Metastasis and ROCK 24, to also play them cooperatively with other players.
Synergy tries to maintain the true Half-Life 2 gameplay, while still adding in our own unique ideas.
Their web site
is here.
(not had a chance to try it yet, but I will be this weekend)
